CVE-2006-5153: The (1) fwdrv.sys and (2) khips.sys drivers in Sunbelt Kerio Personal Firewall 4.3.268 and earlier do not vali

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MEDIUM 5.0DOWNGRADE

CVE-2006-5153 is a medium-severity flaw (CVSS 5.0) affecting personal firewall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The (1) fwdrv.sys and (2) khips.sys drivers in Sunbelt Kerio Personal Firewall 4.3.268 and earlier do not validate arguments passed through to SSDT functions, including NtCreateFile, NtDeleteFile, NtLoadDriver, NtMapViewOfSection, NtOpenFile, and NtSetInformationFile, which allows local users to cause a denial of service (crash) and possibly other impacts via unspecified vectors.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Published	2006-10-05
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kerio

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-10-05 04:04 UTCPublished CVE record published
2026-06-16 22:30 UTCUpdated Record last modified

kerio personal firewall DOWNGRADE

Affected: 4.0.6 · 4.0.7 · 4.0.8 · 4.0.9 · 4.0.10 · 4.0.11 · 4.0.12 · 4.0.13

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.6

1. Check installed version

apt-cache policy personal-firewall || rpm -q personal-firewall || personal-firewall --version

2. No fixed release: DOWNGRADE to a release before 4.0.6 (Debian / Ubuntu)

apt-cache madison personal-firewall sudo apt install personal-firewall=<VERSION_BEFORE_4.0.6> sudo apt-mark hold personal-firewall

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list personal-firewall sudo dnf downgrade personal-firewall-<VERSION_BEFORE_4.0.6> sudo dnf versionlock add personal-firewall

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2006-5153?

personal firewall: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-5153 being exploited?

CVE-2006-5153 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2006-5153 affect?

CVE-2006-5153 affects personal firewall. Severity is medium (CVSS 5.0). The (1) fwdrv.sys and (2) khips.sys drivers in Sunbelt Kerio Personal Firewall 4.3.268 and earlier do not validate arguments passed through to SSDT functions, including NtCreateFile, NtDeleteFile, NtLoadDriver, NtMapViewOfSection, NtOpenFil

How urgent is CVE-2006-5153?

Priority 41/100. Public exploit reference

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References

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